Back to EveryPatent.com
United States Patent | 5,189,718 |
Barrett ,   et al. | February 23, 1993 |
Disclosed is a cable in which one tube holding light waveguides is connected by a plastic web to another tube holding metallic current carrying conductors. When buried in the earth, the cable may be located by means of a magnetic field produced by the current carrying conductors, but the cable retains the advantage of the tube carrying the light waveguides being dielectric.
Inventors: | Barrett; Michael J. (Hickory, NC); Dodd; Andrew S. (Hickory, NC) |
Assignee: | Siecor Corporation (Hickory, NC) |
Appl. No.: | 862475 |
Filed: | April 2, 1991 |
Current U.S. Class: | 385/101; 174/117R; 385/100 |
Intern'l Class: | G02B 006/44 |
Field of Search: | 385/101,100,102 174/117 R,117 F,17 R,115 |
4423306 | Dec., 1983 | Fox | 174/115. |
4761053 | Aug., 1988 | Cogelia et al. | 350/96. |
4763983 | Aug., 1988 | Keith | 350/96. |
4852965 | Aug., 1989 | Mullin et al. | 385/101. |
4856867 | Aug., 1989 | Gaylin | 350/96. |
4952020 | Aug., 1990 | Huber | 350/96. |
Foreign Patent Documents | |||
0321278 | Jun., 1989 | EP | 385/101. |